<!--
 * Tencent is pleased to support the open source community by making BK-JOB蓝鲸智云作业平台 available.
 *
 * Copyright (C) 2021 THL A29 Limited, a Tencent company.  All rights reserved.
 *
 * BK-JOB蓝鲸智云作业平台 is licensed under the MIT License.
 *
 * License for BK-JOB蓝鲸智云作业平台:
 *
 *
 * Terms of the MIT License:
 * ---------------------------------------------------
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and
 * to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of
 * the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
 * THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
-->

<template>
  <div
    class="jb-diff"
    :class="classes">
    <div
      ref="content"
      v-html="html" />
  </div>
</template>
<script>
  import { createPatch } from 'diff';
  import * as Diff2Html from 'diff2html';
  import hljs from 'highlight.js/lib/core';
  import bash from 'highlight.js/lib/languages/bash';
  import diff from 'highlight.js/lib/languages/diff';
  import go from 'highlight.js/lib/languages/go';
  import javascript from 'highlight.js/lib/languages/javascript';
  import json from 'highlight.js/lib/languages/json';
  import perl from 'highlight.js/lib/languages/perl';
  import powershell from 'highlight.js/lib/languages/powershell';
  import python from 'highlight.js/lib/languages/python';
  import sql from 'highlight.js/lib/languages/sql';
  import typescript from 'highlight.js/lib/languages/typescript';
  import xml from 'highlight.js/lib/languages/xml';
  import _ from 'lodash';

  import 'highlight.js/styles/dark.css';

  const languageList = [
    { lang: 'javascript', mod: javascript },
    { lang: 'json', mod: json },
    { lang: 'shell', mod: bash },
    { lang: 'bash', mod: bash },
    { lang: 'go', mod: go },
    { lang: 'xml', mod: xml },
    { lang: 'python', mod: python },
    { lang: 'typescript', mod: typescript },
    { lang: 'sql', mod: sql },
    { lang: 'perl', mod: perl },
    { lang: 'powershell', mod: powershell },
    { lang: 'diff', mod: diff },
  ];
  languageList.forEach((item) => {
    hljs.registerLanguage(item.lang, item.mod);
  });

  export default {
    name: 'Diff',
    props: {
      oldContent: {
        type: String,
        default: '',
      },
      newContent: {
        type: String,
        default: '',
      },
      context: {
        type: Number,
        default: Infinity,
      },
      format: {
        type: String,
        default: 'line-by-line',
      },
      theme: {
        type: String,
        default: 'light',
        validator: value => ['light', 'dark'].includes(value),
      },
      language: {
        type: String,
        default: '',
      },
    },
    data() {
      return {
        html: '',
      };
    },
    computed: {
      classes() {
        return [this.theme, `format-${this.format}`];
      },
    },
    created() {
      const unwatch = this.$watch(() => `（${this.language}）${this.oldContent + this.newContent}`, () => {
        const oldContent = `${this.oldContent}\n// --end--`;
        const newContent = `${this.newContent}\n// -- end--`;

        const dd = createPatch('', oldContent, newContent, '', '', {
          context: this.context,
        });
        const html = Diff2Html.html(dd, {
          drawFileList: false,
          fileListToggle: false,
          fileListStartVisible: false,
          fileContentToggle: false,
          matching: 'lines',
          outputFormat: 'side-by-side',
          synchronisedScroll: true,
          highlight: true,
          renderNothingWhenEmpty: false,
        });
        this.html = html;
        setTimeout(() => {
          const blocks = this.$refs.content.querySelectorAll('span');
          const language = _.find(languageList, ({ lang }) => lang === this.language.toLocaleLowerCase());
          blocks.forEach((node) => {
            const text = node.textContent;
            const result = language
              ? hljs.highlight(text, {
                language: language.lang,
                ignoreIllegals: false,
              })
              : hljs.highlightAuto(text);
            node.innerHTML = result.value;
          });
        });
      }, {
        immediate: true,
      });
      this.$once('hook:beforeDestroy', () => {
        unwatch();
      });
    },
  };
</script>
<style lang="postcss">
  .jb-diff {
    .d2h-file-header {
      display: none;
    }

    tbody {
      tr:last-child {
        display: none;
      }
    }
  }
</style>
